Methods and device for digitally signing data

Abstract

Methods and device for digitally signing documents (140) by using a portable device (110) that encodes a signature string to sound. The acoustic signature string may be transmitted and then decoded (150) back into digital data. The signature string may be further processed to verify the signature of the document and to produce a certificate of identity and integrity for the document. The certificate of identity and integrity may be used to further identify and validate the document and its signer.

Description

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AI Technical Summary

Benefits of technology

The present invention provides a method for securely transferring information using a phone and a special code. A phone gate server is used to receive the code and decrypt it to recover the original file. The file is then sent to a national trusted certificate service (NTCS) which issues a certificate of integrity and identity. The certificate is then sent to the recipient who checks the file by applying a hash function to it and comparing it with the certificate. This ensures that the file has not been tampered with and is authentic.

Problems solved by technology

The technical problem addressed in this patent text is the lack of portability and security in current digital signature solutions. This limits the use of digital signatures to one specific computer and makes it difficult for them to be accepted by third parties. The lack of secure protection for private keys also contributes to the lack of widespread use of digital signatures. Current solutions such as chip cards or USB tokens require special equipment and can result in repudiation claims. The use of digital signatures on personal computers is also restricted, and the CA/revocation list system is not well understood.

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